Which statement correctly describes flare fittings?

Which statement correctly describes flare fittings?

• A. They require soldering to seal.
• B. They are used only for plastic tubing.
• C. They cannot resist pressure.
• D. A flare fitting provides a pressure-resistant seal without soldering.

Answer: (D)

Flare fittings seal by forming a metal-to-metal seal between a flared tube end and a conical seat inside the fitting. When the flare is created on the tube and the nut is tightened, the flare is pressed against the seat, producing a tight, leak-resistant seal without any solder. They’re designed for rigid metal tubing (like copper) and aren’t used with plastic tubing. If the flare is clean and properly formed and the nut torqued to spec, the connection can withstand system pressure without soldering.

Flare fittings seal by forming a metal-to-metal seal between a flared tube end and a conical seat inside the fitting. When the flare is created on the tube and the nut is tightened, the flare is pressed against the seat, producing a tight, leak-resistant seal without any solder. They’re designed for rigid metal tubing (like copper) and aren’t used with plastic tubing. If the flare is clean and properly formed and the nut torqued to spec, the connection can withstand system pressure without soldering.